meaning - "all but at most one" - What does it mean?


I came around this one just now and I can't tell the meaning of this sentence by the context.



no new vehicle is used unless all but at most one other vehicle has at least 50% of its time scheduled



Does it mean something like "all are, but one is not"?



Answer



"At most one" means zero or one.


"All but at most one" means "all" (all minus zero) or "all but one" (all minus one).


But wow, what a confusing sentence!


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